Smart Metering under HNTAS: What is it, when is it proposed, and what does it mean for heat network operators?

The draft HNTAS documents are out, with a suite of regulatory measures proposed and the consultation window is now closed. Amongst these are proposed measures for smart metering for end-users. Here’s what you need to know.

It's worth noting that these documents are still in draft form and subject to consultation, therefore requirements may change. Below, we highlight some of the key proposed requirements and what this could mean for network operators.

What is the smart metering requirement?

The requirement for smart metering is specified in the draft Metering and Monitoring Standard (MMS), one of the key documents in HNTAS. It sets out requirements

HNTAS also states that where end-user metering is in place, consumption-based billing should be adopted. Consumption-based billing has many advantages both for operators and end-users, and we have demonstrated that installation of end-user metering can reduce network-wide gas consumption by almost half whilst also reducing monthly bills for the majority of residents.

Who does it apply to?

The requirement for smart metering and consumption-based billing will apply to all end-users, with a few exceptions:

• Supported Housing
• Almshouse Accommodation
• University Accommodation

While the above groups are not required to implement consumption-based billing, they will still be expected to meter heat demand in each dwelling in order to report against performance KPIs and understand how their network is performing.

When will it apply?

For new heat networks, it is proposed that smart metering requirements should be fulfilled before supplying heat.

For existing networks already in operation, it is proposed that smart metering requirements should be met either when meters reach the end of their life, or when the network’s ‘Responsible Party’ reaches the first certification stage (whichever is soonest).

For networks who are already expected to comply with the Heat Network Metering and Billing Regulations (2014) , this first certification point should be within the 6^th year of HNTAS launch (currently forecast as 2033). This largely applies to heat networks built after 2014 (when the HNMBR came into force), although some networks, su ch as those with supported housing or student accommodation or where metering has been evidenced as not cost effective, are exempt from the requirement.

For networks who are not already expected to comply with HNMBR (generally those exempt, or with networks built before 2014), a further two years are granted to comply with regulations. The first certification point deadline for these networks is within the 8^th year of HNTAS launch, currently anticipated to be 2035.

What does ‘smart metering’ involve under HNTAS?

For almost all end users, smart meters are required. A ‘smart meter’ is defined under HNTAS as having the following capabilities:

In-home display

An In-Home display is required for consumers. This needs to display the following information:

• Details on how to contact your heat network supplier, including by phone, email and letter
• 30-minute heat data
• Current meter reading
• Energy prices
• Tariff breakdown
• Year-on-year consumption comparisons
• Emergency credit availability (and the amount available)

An In-home display can be a web portal or consumer app on a mobile device. Where it’s on a mobile device, customers should be able to request a physical device where required. Different languages, and large fonts should also be available as required.

Remote Controls

The meter needs to be able to be remotely switch between prepayment and credit modes. Where there is the ability to remotely disconnect and reconnect the device, only encrypted protocols should be used, and a non-disablement calendar should be in place to prevent disconnection for vulnerable consumers during specified periods.

Data Collection

All end-user metering (including where smart metering requirements do not apply) under HNTAS is required to collect extended meter data (EMD) at a frequency of at least 30 minutes. This includes volume, flow and return temperatures, flow rates and power reads, alongside your standard heat read. This is required for the calculation of performance KPIs.

Just incase you didn't know - Our G10 Smart Metering Hub fulfils all proposed HNTAS Smart Metering requirements.

What does this mean for heat network operators?

For heat network operators, the draft HNTAS proposals signal a clear shift towards more consistent, data‑driven network management and consumer transparency. While the requirements will be phased in over time, operators will need to plan ahead for the installation, upgrade and integration of smart metering systems that support detailed data collection, consumption‑based billing and enhanced consumer information. This will require early consideration of technology choices, billing processes, consumer communications and governance arrangements, particularly for existing networks approaching certification milestones. Done well, smart metering can deliver benefits beyond compliance by improving network performance insight, reducing energy use, supporting fairer billing and strengthening trust with end users.

How the G10 meets these metering & billing expectations

The G10 Smart Metering Hub directly supports HNTAS and MMS by delivering accurate data, strong monitoring capability and transparent billing. Key features include:

Real‑time consumption visibility to support accurate, usage‑based billing.

Automated meter discovery & tamper/error detection for assured data quality.

• Open‑access integration with billing systems for transparent, consistent billing.
• Remote tariff management and top‑ups, enabling smoother, more responsive billing processes.
• These capabilities align strongly with the data‑driven, performance‑led approach expected under the draft HNTAS and MMS standards.

Find out more about the award-winning G10 Smart Metering Hub here.

Key takeaways

• Smart metering is central to HNTAS compliance: The draft HNTAS places smart metering and consumption‑based billing at the heart of future regulation, making accurate data and transparent billing a core expectation rather than a nice‑to‑have.
• Most heat network end users will be affected: With limited exemptions (such as supported housing and student accommodation), the proposed requirements apply broadly across new and existing heat networks, meaning most operators will need to plan for change.
• Implementation will be phased but planning must start now: While existing networks have several years before compliance deadlines, smart metering requirements are linked to certification milestones, making early technology and investment decisions critical.
• Smart metering enables benefits beyond compliance: Consumption‑based billing and extended meter data can significantly reduce energy use, lower bills for residents, improve network performance insight, and support fairer outcomes for consumers.
• Technology readiness will determine compliance success: Operators will need metering and data platforms capable of supporting remote functionality, detailed performance monitoring, and enhanced consumer information, aligning technical capability with regulatory expectations under HNTAS.

Consultation on wider HNTAS proposals closed on the 15^th April. There is a separate channel for any specific feedback the MMS (e.g., specific KPIs/technical requirements) alongside the code documents and TS1. We encourage anyone who has an interest in heat networks and any thoughts on upcoming regulation to have their say and provide feedback through the relevant channels. The Technical Feedback process closes on 25^th May.